The Gyarados (8 / 110) card can be found in the Holon Phantoms set.
Recently sold 2 times and based on those sales is worth around £48.88.
Currently, there are 7 open listings for this card on ebay.
This card sells in the range of £27.77 to £69.99, making it highly volatile.
This Rare Holo card was illustrated by Hajime Kusajima.